Li-Ning's No.1 string promises 'Repulsion Power' like never before. The string comprises two components, the core, and the outer layer. The core is made of thousands of strands wounded together to provide you with a heat resistant and high-intensity string. The outer layer is also made of heat resistant and high-intensity nylon, which ensures that tension is evenly spread throughout the head of the racket. This string has the unique capacity to redirect and snap back for that extra mile in your shots, moreover, it offers good repulsion and that crisp hitting sound which every player desires.